And now the snakes are on the alert.

这些游蛇正虎视眈眈。

" Everybody is on the alert because of what happened with AstraZeneca, "

" 由于阿斯利康事件，现在所有人都保持警惕。"

On Christmas Eve, the children were on the alert for any sign of Santa Claus.

在圣诞夜，孩子们随时注意圣诞老人出现的蛛丝马迹。

A single bull would need to be on the alert to every form of danger.

独行的雄龙需要留意各种形式的危险。

His ears, his nostrils were on the alert.

他的耳朵， 他的鼻孔都处于警戒状态。

Instantly the askaris and the whites were on the alert.

阿卡里人和白人立即警觉起来。

Be on the alert for anyone acting suspiciously.

【alert】警惕举止可疑的人。

The dog too was on the alert in an instant, and ran whining to the door.

狗也立刻警觉起来，呜呜叫着跑到门口。

He had been on the alert all the while, trying to catch what the governor and Sipiagin were saying.

他一直保持警惕， 想听懂州长和西皮亚金在说什么。

The cynicism prevailing among the convicts and their overseers was such that every woman, especially the young women, had to be on the alert.

罪犯和他们的监工中普遍存在的愤世嫉俗使得每个女人， 尤其是年轻女性， 都必须保持警惕。

As his eyes followed the print the rest of his senses were on the alert to the various commotions that went on around him.

当他的眼睛追随着印记时， 他其余的感官都对周围发生的各种骚动保持警惕。

" Now, Carter, be on the alert, " he said to this last: " I give you but half-an-hour for dressing the wound, fastening the bandages, getting the patient downstairs and all" .

“现在，卡特，保持警惕，”他对最后一位说：“我只给你半小时的时间来包扎伤口、系紧绷带、把病人送下楼等等”。

Officials in department of homeland security have reportedly advised some airlines including those flying to Russia for this week's Winter Olympic in Sochi to be on the alert for potential efforts to smuggle bombing making materials on board.

据报道，美国国土安全部官员建议一些航空公司对飞机上可能有走私炸弹原料的情况保持警惕，其中就涉及在索契冬奥会期间飞往俄罗斯的航班。

" Contessa Rocca di Santo Fiume" ! Paklin repeated after her; " and drinking her tea in the typical Russian way! That's rather suspicious, you know! The police would be on the alert in an instant" .

“Contessa Rocca di Santo Fiume” ！帕克林跟着她重复了一遍； “并以典型的俄罗斯方式喝她的茶！这很可疑，你知道的！警察会立即保持警惕” 。

They listened. An arrival was such a phenomenon at this unfrequented mansion, and particularly a late arrival, that no servant was on the alert to respond to the call; and the visitor rang again, more loudly than before.

他们听了。在这座人迹罕至的豪宅里，有人来是一种现象，尤其是迟到，以至于没有仆人警觉地回应召唤；来访者又按铃了，比刚才响亮了。